A syringe is a simple pump consisting of a plunger that fits tightly in a tube. The plunger can be pulled and pushed along inside a cylindrical tube (called a barrel), allowing the syringe to take in and expel a liquid or gas through an orifice at the ......

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No Side Effect Local Anesthetic Drugs Dibucaine Hydrochloride CAS 61-12-1 for Pian Relieve